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CVE-2026-23519

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Date: January 15, 2026

RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.

Severity Score

Related Resources (6)

https://rustsec.org/advisories/RUSTSEC-2026-0003.html
https://github.com/RustCrypto/utils
https://nvd.nist.gov/vuln/detail/CVE-2026-23519
https://github.com/RustCrypto/utils/security/advisories/GHSA-2gqc-6j2q-83qp
https://github.com/RustCrypto/utils/commit/55977257e7c82a309d5e8abfdd380a774f0f9778
https://www.mend.io/vulnerability-database/CVE-2026-23519

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Observable Timing Discrepancy

CWE-208

Top Fix

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Upgrade Version

Upgrade to version cmov - 0.4.4;https://github.com/RustCrypto/utils.git - cmov-v0.4.4

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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